don't know the strain, but all four were very dark when I bought them. I was lead to believe that getting them young (about silver dollar size) and with dull colors would mean they weren't fed a bunch of hormones to make them bright, and that would give them a better shot at surviving. One has already brightened up quite a bit, in the pics he/she is the more orange of the four.
The store had a bunch of different discus, I intentionally bought the ones that weren't marked "wild" hoping that would make them more stable.
They seem to be doing well so far, they are even getting used to me walking by the tank. They are starting to come to the front of the tank to see me but they do still hang out in the plants and under the DW most of the time.
My tank pH (7.4) was much higher than the tank at the store (6.8) but I drip acclimated them and they do seem to be doing well. Hungry little buggers though, almost can't feed them enough.
Any coaching on keeping them is most welcome.